[Radiance-general] Re: Radiance Vs Viz
Greg Ward
gward at lmi.net
Wed May 19 18:04:36 CEST 2004
Another P.S... Following the quoted conversation from Pillo, I went
off and improved the material handling for sources (and virtual
sources) so that it does look up the modifier tree past patterns and
things that might come between the material primitive and the object.
(If you understood that last sentence, you're probably in the top 2% of
this class.) However, the code still isn't smart enough to consider
mixfunc's that make material assignment as part of ray evaluation,
which is basically incompatible with a priori assessments of which
surfaces are considered light sources and which surfaces aren't. In
other words, don't expect me to fix this anytime soon.
If you are trying to reflect objects in a surface, the "mirror"
primitive allows you to specify any alternate material you choose when
it is not participating in the virtual source calculation. This should
be enough to do what you want in most cases.
The Lord of Radiance has spoked.
-Greg
> From: Giulio Antonutto <Giulio.Antonutto at arup.com>
> Date: May 19, 2004 8:10:39 AM PDT
>
from the "Lord":
"That is correct -- Radiance only finds virtual source objects using
mirror or prism material types directly. It doesn't even look if you
have a modifier in front of the material in the chain (e.g., you
reference a pattern before the material)."
cheers!
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